Sedro-Woolley is an eastern Skagit County city along the Skagit River, known as the "Gateway to the North Cascades." Accessory buildings can reach up to 20 feet in height — taller than most cities in the region — with 5-foot side and rear setbacks. Maximum lot coverage is 35%. The city adopts the 2018 IRC, which exempts one-story accessory structures under 120 square feet from building permits. Here's what the Sedro-Woolley Municipal Code says.
| Shed Permit Rules | City of Sedro-Woolley |
|---|---|
| Max Shed Size (No Permit) | 120 sq ft (per 2018 IRC as adopted) |
| Max Shed Height (Overall) | 20 ft for accessory buildings |
| Setbacks (Side) | 5 ft for one-story accessory structures |
| Setbacks (Rear) | 5 ft for accessory structures |
| Setbacks (Front) | 20 ft (all structures) |
| Max Lot Coverage | 35% |
Sedro-Woolley adopts the 2018 IRC and IBC. The 120 sq ft threshold is the state standard per WAC 51-16-080.
Lot coverage variance may be available if proposed coverage doesn't exceed the average of neighboring properties within 100 feet.
“Maximum building height: twenty feet for accessory buildings. One-story dwellings and accessory structures shall have a minimum of five feet on the side. Rear setback: five for accessory.”
SWMC 17.08.020 — Accessory Building Height and Setbacks (R-5) →
“Maximum lot coverage is 35% overall, with variance provisions available if the proposed coverage does not exceed the average of neighboring properties within 100 feet.”
SWMC 17.08.050 — Maximum Lot Coverage →
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Building codes and permit requirements are subject to change. Contact your local building department to verify current regulations before beginning your project.
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